Threats to internal validity relate to experimental errors and biases [1]}. We asked participants to suggest edits using EditEx (treatment group) and SO's standard edit system (control group). The suggested edits were either accepted or rejected by the expert review. However, the accepted edits could be rejected later by a rollback that might affect the edit rejection ratio. We thus further analyzed how many accepted edits were rejected by rollbacks in our dataset. However, such a statistic was less than 1% in our dataset. Thus, it might not affect our results significantly.
